Year	%
1996	42.19514
1999	36.03661
2000	35.76802
2001	36.48276
2002	36.98304
2003	36.46866
2006	34.49802
2007	40.70984
2008	40.23638
2009	39.02478
2010	40.04202
2011	38.3649
2012	31.04038
2013	32.50037
2015	38.92583
2016	38.76792
2017	36.94337
2018	31.22307
2019	28.25515
2020	30.23068
2021	30.05164