Year	%
1997	4.000000000000001
1998	3.604216252975179
1999	4.173678895994614
2000	4.207011686143571
2001	4.343468092215165
2002	5.8960692871419065
2003	5.876358695652175
2004	6.591957811470014
2005	6.171548117154819
2006	8.057742782152241
2007	8.352910467240939
2008	8.300704776820682
2009	8.780991735537194
2010	10.426065162907266
2011	10.052910052910045
2012	13.146997929606618
2013	15.936018957345972
2014	16.087859899079845
2015	16.384683882457697
2016	17.085040983606564
2017	16.302136317395743
2018	16.679379608441412
2019	16.363636363636378
2020	18.32911392405065
2021	17.008569202804463
2022	17.486338797814202
2023	16.82984916644615