Year	%
1990	33.89
1993	36.02
1995	40.03
1996	34.28
1997	29.63
1998	27.75
1999	28.71
2000	28.37
2001	28.92
2002	25.19
2003	28.55
2004	23.86
2005	27.49
2006	26.76
2007	23.3
2008	21.04
2009	20.21
2010	16.19
2011	22.3
2012	22.19
2013	21.58
2014	21.85
2015	21.93
2016	23.03
2017	26.3
2018	26.18
2019	28.84
2020	25.27
2021	25.46