Year	Percent
1972	41.31342
1973	43.27804
1974	45.64692
1975	51.2416
1976	57.37763
1977	60.53847
1978	63.15657
1979	63.01561
1980	62.53661
1981	66.40612
1982	67.80984
1983	70.23853
1984	74.53523
1985	87.99756
1986	72.28838
1987	74.22572
1988	75.24168
1989	78.11444
1990	77.01406
1991	76.183
1992	79.41767
1993	79.18177
1994	78.4275
1995	79.89765
1996	83.04563
1997	83.28284
1999	82.3502
2000	79.73746
2001	85.92341
2002	87.84349
2003	89.60122
2004	91.33145
2005	93.18503
2006	83.74856
2007	94.48726
2008	113.03644
2009	91.83434
2010	95.53892
2011	97.56832
2012	101.45018
2013	105.91317
2014	108.28085
2015	105.43642
2016	105.44688