Year	%
1997	20.5980066445183
1998	20.5980066445183
1999	20.5980066445183
2001	20.5980066445183
2002	20.5980066445183
2003	20.5980066445183
2004	21.1038961038961
2005	21.1038961038961
2006	20.7792207792208
2007	21.3114754098361
2008	22.0779220779221
2009	22.0779220779221
2010	22.0779220779221
2011	24.7557003257329
2012	24.6753246753247
2013	24.6753246753247
2014	25.0814332247557
2015	26.0355029585799
2016	26.0355029585799
2017	26.2686567164179
2018	26.9461077844311
2019	28.9940828402367
2020	28.9940828402367
2021	30.4733727810651
2022	30.4733727810651
2023	30.6547619047619