Year	%
1990	27.269866848121083
1991	27.49002734488786
1992	28.12344233681253
1993	28.436196120460302
1994	28.558002828806995
1995	28.776724846282885
1996	28.944704415924715
1997	28.887135152078116
1998	28.95793586213168
1999	28.79030637821636
2000	29.070758688396193
2001	29.52221256939505
2002	29.399709072673613
2003	29.387705772006107
2004	29.23111455484912
2005	29.217421451498478
2006	28.874305777397627
2007	28.736495645861016
2008	28.638369380976027
2009	28.477214536188356
2010	27.990800822189968
2011	27.78323010832437
2012	27.552500186188745
2013	27.371658981112674
2014	27.240964075498354
2015	27.021862176282507
2016	26.981962028167345
2017	26.82321292321185
2018	26.74483587880547
2019	26.69703057035475
2020	26.58296428939821
2021	26.53043321551205