Year	Percent
1981	87.98959
1983	92.8626
1984	93.60157
1985	92.17088
1986	90.03865
1987	87.92088
1988	86.27613
1989	87.64585
1998	87.8469
1999	89.21005
2001	105.38997
2002	98.21783
2003	98.59631
2004	97.00144
2005	97.29945
2006	94.8079
2007	93.77375
2008	94.8682
2009	94.58733
2013	102.67306
2015	104.11529