Year	%
1992	32.17
1993	30.29
1994	27.93
1996	19.76
1997	15.82
1998	15.5
1999	14.46
2000	14.67
2001	14.11
2002	7.72
2003	6.48
2004	5.96
2005	4.87
2006	4.25
2007	5.07
2008	4.47
2009	3.94
2010	4.65
2011	5.99
2014	4.74
2015	4.52
2016	3.54
2017	3.83
2018	3.39
2019	2.53
2020	2.47
2021	2.31