Year	%
1991	1.677129
1992	16.46958
1994	19.54801
1995	22.40898
1996	19.73834
1997	20.56377
1998	20.58937
1999	20.74054
2000	22.5627
2001	22.48724
2002	23.17685
2003	22.75112
2004	20.72866
2005	21.53221
2006	19.16419
2007	40.98051
2008	41.37587
2009	41.20208
2010	19.95921
2011	17.27228
2012	0.7947721
2013	17.87185
2014	17.66989
2015	1.003731
2016	0.8215226
2017	9.245665
2018	0.4708798
2019	0.4911052
2020	0.3805297
2021	5.473052