Year	Percent
1986	398.07309
1987	362.55632
1988	411.04025
1989	69.68873
1990	42.0951
1991	72.54638
1992	32.62918
1993	17.41497
1994	16.95232
1995	17.0402
1996	8.69677
1997	6.5974
1998	8.83786
1999	5.7347
2000	3.40883
2001	2.62226
2002	4.69893
2003	7.1096
2004	8.43331
2005	18.81052
2006	8.56895
2007	9.63023
2008	22.67332
2009	6.21562
2010	12.0743
2011	21.26066
2012	10.92603
2013	4.76065
2014	3.66238
2015	-0.19079
2016	1.11065
2017	4.12492