Year	Percent
1990	5.284
1991	5.271
1992	5.444
1993	5.563
1994	5.585
1995	5.669
1996	5.785
1997	5.914
1998	6.022
1999	6.128
2000	6.217
2001	6.217
2002	6.314
2003	6.279
2004	6.275
2005	6.439
2006	6.636
2007	6.785
2008	7.624
2009	8.559
2010	8.305
2011	11.3
2012	13.2
2013	12
2014	12.54
2015	13.1
2016	13.42
2017	13.609
2018	13.798
2019	13.988
2020	14.177
2021	14.367
2022	14.556
2023	14.745
2024	14.935
2025	15.124
2026	15.314
2027	15.503
2028	15.692
2029	15.882
2030	16.071