Year	%
1989	105.36
1990	55.04
1992	56.02
1993	23.09
1994	46.9
1995	50.26
1996	36.32
1997	25.24
1998	27.56
1999	26.33
2000	22.94
2001	21.94
2002	22.85
2003	18.98
2004	19.82
2005	15.62
2006	14.44
2007	13.8
2008	12.6
2009	13
2010	12.34
2011	12.93
2012	11.4
2013	11.64
2014	11.48
2015	10.73
2016	11.16
2017	9.62