Year	%
1990	89.89928
1992	79.11464
1996	73.13982
1997	73.65854
1999	73.73318
2000	87.57787
2001	82.77191
2002	77.11002
2003	78.63474
2004	78.76026
2005	52.05552
2006	41.70282
2007	51.15042
2008	45.00702
2009	36.14518
2010	32.03392
2011	36.41387
2012	37.34824
2013	37.2926
2015	33.65427
2016	38.94114
2017	39.51456
2018	39.27744
2019	43.89576
2020	35.99563
2021	32.84572