Year	%
1990	25.1882984478382
1991	25.7284977170645
1992	26.238138349596
1993	26.7124337246008
1994	27.1480778492309
1995	27.5466701972726
1996	27.8838789376158
1997	27.9943496388781
1998	27.9797427923006
1999	27.9756207145787
2000	28.0203064291474
2001	28.1514499791869
2002	28.3669561197874
2003	28.638008120448
2004	28.9357959542656
2005	29.2167752656667
2006	29.4571905088927
2007	29.6639426059282
2008	29.8233545757784
2009	29.94350988577
2010	30.0449619691655
2011	30.1307958396907
2012	30.2241707710167
2013	30.3115404368778
2014	30.3925209843268
2015	30.4689357215946
2016	30.5402570154734
2017	30.608700800221
2018	30.6761882644372
2019	30.7411318170144
2020	30.8265951259779
2021	30.9104394585574
2022	30.9629874058186