Year	%
1991	40.93946
1994	7.650722
1995	26.37721
1996	23.29547
1997	22.92605
1998	22.9714
1999	27.00195
2000	33.70555
2001	29.49064
2002	28.94354
2003	31.31115
2004	27.23358
2005	18.36173
2006	15.64966
2007	17.29699
2008	18.62642
2009	17.76687
2010	18.78538
2011	20.13717
2012	19.30266
2013	19.05177
2014	18.67876
2015	18.44423
2016	18.80867
2017	17.88687
2018	17.51672
2019	17.51224
2020	16.05209
2021	17.07655