Year	Percent
1990	18.18
1991	20.7
1992	17.032
1993	13.9
1994	15.004
1995	16.18
1996	14.07
1997	14.436
1998	14.81
1999	15.74
2000	15.97
2001	14.307
2002	12.79
2003	13.726
2004	14.719
2005	15.77
2006	13.66
2007	13.18
2008	12.76
2009	12.234
2010	13.538
2011	12.255
2012	11.077
2013	10
2014	14.76
2015	12.2
2016	12.354
2017	12.168
2018	11.982
2019	11.796
2020	11.609
2021	11.423
2022	11.237
2023	11.05
2024	10.864
2025	10.678
2026	10.492
2027	10.305
2028	10.119
2029	9.933
2030	9.746