Year	Percent
1979	28.91701
1980	39.84857
1981	30.79267
1982	21.43579
1983	30.53119
1984	25.84942
1985	32.96508
1986	65.55754
1987	81.6495
1988	58.39795
1989	46.89117
1990	34.72419
1991	44.51173
1992	41.6012
1993	65.63203
1994	67.92809
1995	66.77761
1996	78.06025
1997	68.05967
1998	82.45906
1999	110.15466
2000	89.82256
2001	99.18451
2002	96.34976
2003	125.57074
2004	126.88305
2005	116.07947
2006	146.99206
2007	152.39105
2008	64.9707
2009	136.20937
2010	127.11183
2011	85.93588
2012	89.85772
2013	86.79934
2014	87.96911
2015	87.99507
2016	105.00435
2017	113.98208