Year	%
1997	42.14619
1998	2.120507
1999	4.290927
2000	4.96614
2001	4.764191
2002	4.726994
2003	5.89894
2004	6.743919
2005	6.791521
2006	7.566948
2007	52.63393
2008	50.23869
2009	8.004948
2010	7.228723
2011	7.041047
2012	7.923475
2013	34.31874
2015	5.91623
2020	11.2766
2021	10.03894