Year	%
1990	74.78
1992	44.88
1996	32.34
1997	26.01
1999	28.79
2000	34.1
2001	34.66
2002	30.9
2003	30.46
2004	31.17
2005	28.36
2006	24.82
2007	27.84
2008	22.93
2009	22.78
2010	22.49
2011	23.29
2012	25.63
2013	25.42
2015	24.33
2016	24.39
2017	24.14
2018	24.37
2019	26.62
2020	24.81
2021	24.74