Year	Percent
1999	11.10698
2000	8.39505
2001	9.74942
2002	9.22498
2003	9.81056
2004	9.44048
2005	7.69131
2006	7.54308
2007	7.57063
2008	6.58668
2009	9.34337
2010	8.46644
2011	8.11059
2012	8.77069
2013	9.85112
2014	10.2864
2015	11.57871
2016	12.22009
2017	11.75609
2018	11.87437
2019	12.33695
2020	13.78424
2021	12.17566
2022	11.58519