1980
0.0020757
1981
0.0020757
1982
0.0020757
1983
0.0020757
1984
0.0020757
1985
0.0020757
1986
0.0020757
1987
0.0020757
1988
0.0020757
1989
0.0020757
1990
0.0020757
1991
0.0020757
1992
0.0020757
1993
0.0020757
1994
0.0020757
1995
0.0020757
1996
0.0020757
1997
0.00202686
1998
1.86406
1999
1.51404
2000
1.19658
2001
1.03378
2002
0.881265
2003
0.91
2004
0.945
2005
0.9775
2006
0.988
2007
1
2008
1
2009
1
2010
1
2011
1
2012
1
2013
1
2014
1
2015
1
2016
1
2017
1
2018
1
2019
1
2020
1
2021
1
*****