Year	Percent
1991	6.497
1992	6.904
1993	7.201
1994	7.936
1995	8.583
1996	8.986
1997	9.751
1998	10.418
1999	11.028
2000	11.907
2001	12.437
2002	13.055
2003	13.425
2004	14.307
2005	15.06
2006	16.088
2007	17.648
2008	18.242
2009	18.004
2010	18.465
2011	19.044
2012	19.367
2013	19.554
2014	19.603
2015	19.658
2016	20.444
2017	20.695
2018	21.213
2019	21.688
2020	22.202
2021	22.658
2022	23.143