Year	%
1989	114.01
1990	56.8
1992	55.73
1993	21
1994	54.14
1995	51.25
1996	27.41
1997	25.44
1998	25.37
1999	23.15
2000	21.14
2001	21.17
2002	19.84
2003	17.8
2004	16.88
2005	16.63
2006	13.77
2007	13.89
2008	13.39
2009	14.26
2010	13.99
2011	14.12
2012	11.55
2013	11.6
2014	11.35
2015	13.63
2016	12.96
2017	12.31