Year	%
1997	11.0599078341014
1998	12.4423963133641
1999	12.4423963133641
2000	11.2612612612613
2001	17.7570093457944
2002	17.7570093457944
2003	17.7570093457944
2004	15.2542372881356
2005	15.2542372881356
2006	15.2542372881356
2007	20.5020920502092
2008	20.5020920502092
2009	20.9737827715356
2010	22.1428571428571
2011	22.887323943662
2012	22.887323943662
2013	27.3356401384083
2014	27.3356401384083
2015	27.2413793103448
2016	29.7945205479452
2017	29.4520547945205
2018	29.4520547945205
2019	27.9605263157895
2020	27.9605263157895
2021	27.9605263157895
2022	27.3311897106109
2023	27.3311897106109