Year	%
1997	34.92265
1999	35.07677
2000	25.77699
2001	25.73777
2002	25.40126
2003	25.61795
2004	26.62263
2005	26.41018
2006	15.69174
2007	25.65032
2008	25.4813
2009	15.10838
2010	24.47912
2012	15.80403
2013	15.80682
2018	8.819514
2019	10.33167
2020	10.06113
2021	9.742276