Year	annual %
1991	11.99358111515916
1992	13.171745343996676
1993	16.375907863770166
1994	20.784364435650843
1995	45.74334276276528
1996	36.77008789747319
1997	13.290492691958093
1998	-8.342951750043085
1999	33.46090536099044
2000	23.346051923834082
2001	2.748200453706488
2002	8.71188048361509
2003	10.892342838930233
2004	14.113319988449845
2005	18.533353551815708
2006	13.588647275420968
2007	10.888282434850154
2008	20.37774623576496
2009	-8.705270020296638
2010	23.616292018244934
2011	18.11366666967156
2012	5.893158922512924
2013	9.208957049150769
2014	7.163324220027945
2015	46.47625122557781
2016	0.1344108442609837
2017	18.5535661652076
2018	14.853664766183059