Year	Percent
1994	18.30408
1995	18.74552
1996	19.29855
1997	16.93307
1998	16.32998
1999	16.22535
2000	16.51051
2001	18.71887
2002	19.84501
2003	20.73053
2004	21.65811
2005	20.89706
2006	22.18771
2007	21.47237
2008	22.40083
2009	20.5648
2010	22.32388
2011	22.20844
2012	18.9765
2013	19.06987