Ind,Year,Value
one,2017,7.9
one,2016,8.6
one,2015,8.8
one,2014,9.1
one,2013,9.3
one,2012,9.4
one,2011,9.4
one,2010,9.5
one,2009,9.8
one,2008,10.3
one,2007,10.3
one,2006,10.6
one,2005,11.6
one,2004,12.9
one,2003,12.3
one,2002,13.3
one,2001,14
one,2000,14.7
one,1999,16.1
one,1998,17.2
one,1997,17.9
one,1996,19.3
one,1995,19.6
one,1994,19.5
one,1993,19.3
one,1992,21.3
one,1991,24
one,1990,26.6
one,1989,24.6
one,1988,25.2
one,1987,26.3
one,1986,26.6
one,1985,27.9
one,1984,31.5
one,1983,32.6
one,1982,32.8
one,1981,31.3
one,1980,29.6
one,1979,30.7
one,1978,27.7
two,2017,40.5
two,2016,39.9
two,2015,40.9
two,2014,43.1
two,2013,44
two,2012,45.3
two,2011,46.4
two,2010,46.4
two,2009,45.9
two,2008,46.9
two,2007,46.9
two,2006,47.6
two,2005,47
two,2004,45.9
two,2003,45.6
two,2002,44.5
two,2001,44.8
two,2000,45.5
two,1999,45.4
two,1998,45.8
two,1997,47.1
two,1996,47.1
two,1995,46.8
two,1994,46.2
two,1993,46.2
two,1992,43.1
two,1991,41.5
two,1990,41
two,1989,42.5
two,1988,43.5
two,1987,43.3
two,1986,43.5
two,1985,42.7
two,1984,42.9
two,1983,44.2
two,1982,44.6
two,1981,46
two,1980,48.1
two,1979,47
two,1978,47.7
three,2017,51.6
three,2016,51.6
three,2015,50.2
three,2014,47.8
three,2013,46.7
three,2012,45.3
three,2011,44.2
three,2010,44.1
three,2009,44.3
three,2008,42.8
three,2007,42.9
three,2006,41.8
three,2005,41.3
three,2004,41.2
three,2003,42
three,2002,42.2
three,2001,41.2
three,2000,39.8
three,1999,38.6
three,1998,37
three,1997,35
three,1996,33.6
three,1995,33.7
three,1994,34.4
three,1993,34.5
three,1992,35.6
three,1991,34.5
three,1990,32.4
three,1989,32.9
three,1988,31.2
three,1987,30.4
three,1986,29.8
three,1985,29.4
three,1984,25.5
three,1983,23.2
three,1982,22.6
three,1981,22.7
three,1980,22.3
three,1979,22.3
three,1978,24.6