Year	Percent
1989	90.78728
1990	95.89328
1991	68.71287
1992	60.12941
1993	57.55914
1994	31.0961
1995	34.80281
1996	37.60139
1997	46.17348
1998	44.54975
1999	49.57043
2000	47.97028
2001	44.40982
2002	44.31289
2003	46.66978
2004	51.20878
2005	72.93126
2006	78.89798
2007	83.18855
2008	85.46933
2009	76.15414
2010	91.83065
2011	107.29343
2012	108.84921
2013	104.53637
2014	101.60803
2015	94.49027
2016	89.82965
2017	89.0356