Year	Percent
1990	22.94688
1991	22.22222
1992	22.82609
1993	17.15736
1994	13.58961
1995	15.7665
1996	15.0986
1997	13.41793
1998	12.06176
1999	12.70056
2000	12.09683
2001	10.35043
2002	10.12843
2003	8.63563
2004	8.85025
2005	8.51859
2006	8.57873
2007	8.30317
2008	8.66625
2009	8.13139
2010	8.89152
2011	8.00176
2012	8.13105
2013	6.80912
2014	7.30339
2015	6.28295
2016	6.89528
2017	7.5661
2018	6.59009
2019	6.79497
2020	7.07716
2021	6.70684
2022	7.70847