Year	%
1999	40
2000	23.0769230769231
2001	33.7378640776699
2002	34.0136054421769
2003	34.5291479820628
2004	35.1111111111111
2005	35.8255451713396
2006	36.281179138322
2007	36.4428945074106
2008	36.8011323425336
2009	37.3619814980603
2010	38.0005166623612
2011	38.6978450252178
2012	39.3570987018339
2013	39.9289321114644
2014	40.4117747149906
2015	40.7892684448604
2016	41.2095032397408
2017	41.5598290598291
2018	41.8994413407821
2019	42.0893789901335
2020	42.3552588376929
2021	42.563519933898
2022	42.6306060900866