Year	%
1992	0
1993	25
1994	20
1995	31.8181818181818
1996	29.4117647058824
1997	31.4814814814815
1998	31.5533980582524
1999	33.3333333333333
2000	31.9256756756757
2001	30.6468716861082
2002	30.1507537688442
2003	29.9586776859504
2004	30.3689320388349
2005	32.1561338289963
2006	33.6697021904996
2007	34.9950932286555
2008	35.776065419091
2009	36.6525695245419
2010	37.5912795004762
2011	38.2839451570102
2012	38.8714264331687
2013	39.3459442128888
2014	39.349584548506
2015	39.5703896354091
2016	39.962331992124
2017	40.0130673738422
2018	40.0083553822587
2019	39.986056534415
2020	40.0186106022274
2021	40.0262960180316
2022	40.0557574550704