Year	Percent
1991	27.11864
1992	38.1875
1993	61.37226
1994	85.30275
1995	84.2066
1996	75.40931
1997	68.5466
1998	70.80663
1999	83.49497
2000	80.93883
2001	76.86493
2002	53.4062
2003	56.61286
2004	59.5319
2005	47.77678
2006	34.92061
2007	38.69975
2008	40.37564
2009	45.24006
2010	44.47504
2011	43.5313
2012	44.39319