Year	Percent
1967	35.89731
1968	47.49594
1969	39.39336
1970	40.19027
1971	47.1719
1972	45.47529
1973	74.17909
1974	158.95281
1975	111.65499
1976	69.34762
1977	67.33679
1978	80.7079
1979	75.9587
1985	211.77572
1986	122.89853
1987	85.48623
1988	108.49513
1989	96.04874
1990	93.58586
1991	96.45183
1992	72.91545
1993	84.88601
1994	102.26139
1995	94.3113
1996	90.91154
1997	77.03164
1998	59.96642
1999	57.56297
2000	56.62783
2001	49.49583
2002	68.33033
2003	56.6954
2004	49.61428
2005	55.54119
2006	59.39039
2007	52.43245
2008	40.7848
2009	43.74349
2010	42.49982
2011	49.45682
2012	46.56763
2013	55.23639
2014	42.67243
2015	44.16712
2016	35.85705
2017	40.99915
2018	44.58068
2019	46.63761
2020	54.44203
2021	33.69074