Year	Percent
1980	107.97065
1981	110.15567
1982	111.82762
1983	107.16421
1984	116.77205
1985	113.83561
1986	102.81656
1987	108.33227
1988	101.2674
1989	87.86867
1990	88.03004
1991	73.68469
1992	76.01728
1993	71.07269
1994	64.42121
1995	66.58692
1996	69.97855
1997	64.3568
1998	57.74602
1999	60.62419
2000	59.7361
2001	54.50329
2002	59.0178
2003	51.77164
2004	50.81217
2005	53.78403
2006	52.45324
2007	52.80085
2008	55.30983
2009	43.5767
2010	47.48031
2011	52.40626
2012	51.20196
2013	56.08926
2014	50.27034
2015	42.61595
2016	43.31885