Year	%
1989	3.44
1990	3.63
1991	3.67
1992	3.63
1993	3.56
1995	3.95
1996	4
1997	2.34
1998	4.07
1999	8.32
2000	5.13
2001	4.58
2002	3.9
2003	3.71
2004	3.63
2005	3.74
2006	3.7
2007	3.71
2008	3.64
2009	3.96
2010	3.95
2011	4.07
2012	4.14
2013	3.98
2014	3.76
2015	3.86
2016	3.88
2017	8.59
2018	8.24
2019	134.84
2020	3.31
2021	2.89