Year	%
1997	18.1159420289855
1998	18.1159420289855
1999	17.921146953405
2000	17.7935943060498
2001	24.6710526315789
2002	24.6710526315789
2003	24.6710526315789
2004	23.9344262295082
2005	23.9344262295082
2006	29.8192771084337
2007	30.7228915662651
2008	30.7228915662651
2009	31.4814814814815
2010	31.2883435582822
2011	34.9740932642487
2012	34.9740932642487
2013	34.9740932642487
2014	34.9740932642487
2015	34.9740932642487
2016	33.4894613583138
2017	34.2984409799555
2018	34.2984409799555
2019	34.8583877995643
2020	34.8583877995643
2021	33.8129496402878
2022	33.8129496402878
2023	33.8129496402878