Year	%
1988	56.80887
1989	19.58264
1990	24.59278
1992	23.17178
1995	25.17136
1996	27.46733
1997	25.96685
1998	29.53655
1999	26.96253
2000	28.46002
2001	27.84026
2002	29.2902
2003	30.34329
2004	28.50312
2005	30.18512
2006	29.07491
2007	25.42474
2008	31.58838
2009	31.90171
2010	32.61803
2011	32.85232
2012	31.68212
2013	31.27846
2014	22.58227
2015	21.66957
2016	33.14062
2017	20.96731
2018	19.27802
2020	17.96984
2021	16.92291