Year	Percent
1990	8.616
1991	3.604
1992	1.461
1993	1.763
1994	4.118
1995	4.764
1996	3.366
1997	4.835
1998	8.225
1999	5.227
2000	5.571
2001	5.887
2002	6.22
2003	6.571
2004	6.939
2005	7.327
2006	7.735
2007	8.163
2008	8.613
2009	9.085
2010	9.581
2011	10.1
2012	9.3
2013	10.9
2014	9.93
2015	12.026
2016	14.368
2017	14.477
2018	14.585
2019	14.694
2020	14.802
2021	14.911
2022	15.019
2023	15.128
2024	15.236
2025	15.345
2026	15.453
2027	15.562
2028	15.67
2029	15.779
2030	15.887