Year	%
1988	5.292176
1991	3.484525
1993	5.648926
1996	1.573145
1997	0.3704072
1998	1.499615
1999	1.52022
2000	0.2977313
2001	1.198882
2002	2.310183
2003	1.65092
2004	0.079353
2005	1.861089
2006	3.050288
2007	0.7647809
2008	0.2679326
2009	0.0717412
2010	0.0517375
2011	0.8224857
2012	0.8392561
2013	0.31816
2014	2.331313
2016	1.281661
2020	2.264184
2021	2.131932