Year	Percent
1990	7.358
1991	8.127
1992	9.621
1993	11.549
1994	14.853
1995	16.016
1996	15.06
1997	13.75
1998	13.662
1999	13.341
2000	12.741
2001	12.153
2002	12.28
2003	9.445
2004	7.21
2005	7.557
2006	7.92
2007	8.212
2008	8.514
2009	8.826
2010	7.327
2011	6.623
2012	5.982
2013	5.4
2014	6.65
2015	7.8
2016	7.6
2017	7.286
2018	6.972
2019	6.658
2020	6.345
2021	6.031
2022	5.717
2023	5.403
2024	5.089
2025	4.775
2026	4.461
2027	4.147
2028	3.834
2029	3.52
2030	3.206