Trend problem

data <- structure(list(y = c(0.048, 0.031, 0.002816, 0.3, 0.0014, 0.00133,
2.88, 0.001226, 0.0016, 0.09, 0.6, 0.02, 0.008, 0.002, 0.03,
0.000463, 0.50643, 5e-04, 0.0135, 6e-04, 0.003, 0.002, 0.003,
0.021, 0.01, 0.09, 0.22, 1.99465, 0.04, 0, 0.494, 0.004, 0.18,
0.01, 0.01, 0.003, 0.18, 0.031, 0.05, 0, 0.01, 0, 0.003, 0.01,
0.78, 0.06, 0.02, 0.06, 0, 0.01001, 0.004, 1.057244, 0.002, 0.0116,
0.02, 0, 0.04, 0.565611, 0.148755, 0.24, 0, 0, 0.01, 0, 0.00147,
0.07, 0.88443, 0.0028, 0.000974, 0, 0.01, 0.01, 0.32, 0.03, 4e-04,
0.08, 0.0039, 0.0018, 0.14, 0.0015, 0.003, 0, 0.0015, 0, 0.52,
0.06, 0.05, 0.144, 0.07, 0.109109, 0.01, 2, 0.01, 0.06, 0.04,
0.08, 0.03, 0.51, 3e-04, 0.12, 0.0034, 0.00402, 3e-04, 0, 0.01,
0.009, 0.006, 0.0014, 0.05, 0.04515, 0.008, 0.02, 0.0365, 0.02,
4e-04, 2e-04, 0.02, 0.0015, 0.79, 0.046, 9e-04, 2e-04, 5e-04,
0.009524, 0, 0, 2.107679, 1e-04, 8e-04, 0.0028, 0.02, 9e-04,
0.02, 0.4, 0.0002886, 0.0034, 0.01, 0.00804, 0.0288, 0.0083,
0.0015, 0.02082, 0.0055, 0, 0.008, 0, 0.03, 0.0288, 0.005, 2e-04,
0.75, 0.0092, 0.03, 0.027699, 0.001, 0.25, 0.07, 0.0044, 0.028845,
0.0046, 0, 1e-04, 0.85742, 0.04, 0.31, 0.059184, 0.23925, 0.03,
9e-04, 0.0014, 0.123123, 0.0027, 0, 0.0012, 0, 0.55, 0.02, 0.028,
0.1, 0.01, 0.004, 0.013, 6.39, 2.5, 0.44, 0.015, 0, 0.002, 0.04,
0.045, 0.00715, 0.23, 0.0025, 3.564, 0.493, 0.0017, 0.05, 0.02652,
0.411138, 0.001122, 0.007674, 0.078288, 0.00883, 0.012, 9e-04,
0.14, 0.007485, 25, 0.0030196, 0.37, 0.048156, 2.85, 0.003, 0.005,
0.02, 0.03, 0.003736, 0.0038, 1.77, 0.0075, 0.03636, 0.62, 0.043,
0, 0.6, 0.5, 0.006, 0.015, 0.0093, 0.0414, 0.017, 0.057, 4e-04,
13, 0.004, 0.235, 0.0014, 0.019, 0.0085, 0.004, 0, 0.80595, 0.005,
0.00165, 0.1, 4.5885, 0.902902, 0.0004212, 0.11, 0.669392, 0.12,
0, 0.001, 0.1, 0.002137, 0.026, 0.08, 0.14643, 0.01, 0.043, 0.01877,
0.09, 0.0094, 0.02, 1.070064, 0.2, 2.63, 0.012, 0, 3e-04, 0.004,
0.012, 0.01, 0.001818, 0.004, 0.0017, 0.88, 0.137732, 0.362119,
4.995, 0.16, 0.08, 0.009, 0.026, 0.00252, 3.4531, 0.56, 0.012,
0.0173, 0.000465, 0.024, 3.089, 0.17, 0.04, 0.17825, 0.010526,
0.0016, 0.0040965, 0.014, 0.008, 2.07, 0.65, 0.004, 0.02, 0.0035,
0.001364, 0.09, 0.66, 0.04208, 0.01, 0.015, 0.01, 0.012728, 0.007,
0.125502, 0.01, 0.159936, 0.0011, 0.860082, 0.00168682, 0.002,
9e-04, 15.97201, 0.04, 0.0036496, 0.482993, 0, 0.15, 0.57, 0.003,
0, 0.96, 0.01, 0.001, 0.11, 5e-04, 0.008, 0.01105, 0.0043955,
0.005877, 1.04, 0.00059, 0.0092, 0.01, 0.09, 0.072, 0, 0.14,
0.2, 0.15, 0.007, 0.006, 0.15, 0.016924, 0, 0.008, 0.0324, 0.8,
8e-04, 0.0979, 7e-04, 0.008, 0.01, 0.002, 0.00159, 0.14, 0.008,
0, 0, 0.029184, 0.0036, 0.006, 0.014, 0.000652, 0.006), x = c(29.5,
18, 8, 54, 56, 15, 60, 16, 50, 42, 42, 40, 60, 43, 14, 6, 72,
13, 2, 36, 40, 3, 20, 45, 15, 18, 80, 15, 61.5, 20, 93, 22, 38.2,
20, 26, 28, 42, 48, 40, 82, 31, 0, 28, 14, 48, 31, 50, 10, 10,
50, 38, 56, 47, 27, 23.2, 25, 12.6, 16.82, 33, 33, 36.6, 20,
80, 8, 90, 50, 88, 12, 15, 4, 16, 25.99, 18, 80, 22, 35.7, 13,
22, 31, 1.5, 2, 11, 8.43, NA, 28, 46, 77, 57.6, 12, 59, 30, 70,
21, 44, 95, 13.5, 38, 50, 7, 40, 14, 61, 16, 15, 11.1, 22, 5,
18.7, 54.5, 40, 45, 12.8, 51, 46, 15, NA, 50, 4.5, 72, 30, 18,
20, 30, 4.43, 7, 24, 12, 13, 43, 28, 30, 30, 24, 70, 53, 28.5,
30, 0.8, 27, 30, 20, 31, 10.5, 1, 32, 9, 90, 72, 1.3, 30, 52,
12, 10, 42, 22, 44, 7.8, 22.4, 12, 8, 16, 15, 85, 87, 20, 72,
100, 27, 24, 20, 95, 16, 8, 13, 0.57, 85, 82, 3, 10, 26, 50,
71, 48, 85, 11.5, 98, 26, 20, 60, 46, 36, 6.5, 60, 38, 25, 18,
26, NA, 92, 15, 13.8, 69, 90, 48.6, 20, 36, 35, 85, 47, 42, 67,
100, 18, 14, 100, 33.04, 25, 30, 65, 40, 29, 68.5, 31, 1.6, 19,
5, 80, 42, 32, 22, 27, 24, 44, 90, 26, 28, 38, 29, 6, 52, 13,
65, 25, 21.5, 92, 62, 10, 20, 16, 40, 70, 5, 6, 48.9, 29, 41,
80, 18, 29, 80, 33, 47.5, 13, 23, 54, 45, 12, 15, 7, 17.5, 80,
57, NA, 55, 42, 26.8, 14, 43, 72, 75, 30, 24, 10, 65, 43, 17,
85, 15, 9, 27, 75, 73, 35, 48, 37, 97, 5, 27, 11, 40, 27.5, 40,
16, 2, 48, 61, 16.25, 3.5, 33, 8.2, 29, 61, 3, 40, 51, 70, 58,
31, 32.4, 83, 45.2, 20, 33.36, 40, 37, 58, 10, 14, 8, 22, 100,
59.6, 54, 15, 66, 13, 38, 95, 20, 35, 75, 11, 11.6, 39, 31, 41,
27, NA, 80, 34, 25, 66, 49, 18, 1.2, 28.8, 68, 18, 13, 43.03,
10, 11, 13, 80, 4.5, 78, 32, 10, 2, 8, 25, 40, 20, 12, 23)), class = "data.frame", row.names = c(NA,
-375L))