Year	Percent
1976	98.39331
1977	52.25144
1978	54.84523
1979	141.61782
1980	108.44539
1981	61.89375
1982	48.96324
1983	52.58243
1984	47.20735
1985	57.77371
1986	49.84259
1987	42.42978
1988	33.43535
1989	34.50616
1990	74.28298
1991	86.60044
1992	23.91679
1993	15.13676
1994	17.99759
1995	24.37265
1996	24.07375
1997	25.50909
1998	23.97567
1999	24.75783
2000	29.29131
2001	23.82553
2002	29.22204
2003	62.18022
2004	19.34838
2005	16.51247
2006	13.44157
2007	12.1937
2008	8.98671
2009	9.27321
2010	10.04256
2011	10.39235
2012	11.79089
2013	15.27946
2014	28.36172
2015	22.34194
2016	29.21796
2017	28.97232
2018	23.90737
2019	28.22633