Year	Percent
1990	21.80907
1991	18.87109
1992	19.03901
1993	20.99143
1994	19.8854
1995	18.16283
1996	17.5391
1997	17.51052
1998	14.37944
1999	12.64911
2000	10.85392
2001	13.1496
2002	11.34244
2003	11.91438
2004	12.70551
2005	8.4861
2006	7.82081
2007	5.5015
2008	6.30189
2009	6.11643
2010	5.17831
2011	5.95121
2012	4.5404
2013	5.51
2014	4.94855
2015	4.42596
2016	4.29225
2017	4.43885
2018	4.56456
2019	4.42008
2020	4.17885
2021	4.50925
2022	4.47148