Year	%
1997	18.2094081942337
1998	18.2094081942337
1999	18.361153262519
2000	18.361153262519
2001	17.9059180576631
2002	17.9059180576631
2003	17.9059180576631
2004	18.0576631259484
2005	19.6594427244582
2006	19.6594427244582
2007	19.5046439628483
2008	19.5046439628483
2009	19.5046439628483
2010	22
2011	22.3076923076923
2012	22.4615384615385
2013	22.4615384615385
2014	22.6153846153846
2015	29.3846153846154
2016	29.5839753466872
2017	32
2018	32.1538461538462
2019	32
2020	33.8461538461538
2021	34.2592592592593
2022	34.5679012345679
2023	34.6153846153846