Year	%
1988	1.67
1993	1.91
1995	11.08
1996	10.14
1997	11.35
1998	16.75
1999	12.37
2000	14.78
2001	16.59
2002	13.5
2003	12.58
2004	13.96
2005	14.58
2006	12.47
2007	12.43
2008	12.56
2009	12.97
2010	14.38
2011	15.27
2012	17.46
2013	18.62
2014	19.39
2015	19.3
2016	19.42
2017	18.84
2018	16.19
2019	22.56
2020	16.32
2021	14.67