Year	annual % change
1997	-8.72439956665039
1998	-36.9025993347168
1999	-77.0999984741211
2000	33.004486084
2001	85.3675003052
2002	23.3500003815
2003	14.6300001144
2004	46.7000007629
2005	25.9985984583
2006	31.9660734149
2007	3.750921926035194
2008	-8.8047120951
2009	-13.1474754638
2010	9.694954838160786
2011	-9.55280957837223
2012	-7.44440927696819
2013	12.2721831622868
2014	0.726501440441329
2015	-23.3710640771947
2016	-19.0084559845617
2017	-22.2877440041495
2018	22.6011706293595