Year	% (national estimate)
1997	60.196
1998	58.072
1999	57.214
2000	58.609
2001	54.686
2002	74.998
2003	61.347
2004	62.349
2005	57.665
2006	61.307
2007	62.711
2008	63.434
2009	63.801
2010	64.45
2011	63.051
2012	62.738
2013	61.262
2014	59.418
2015	56.574
2016	55.658
2017	57.107
2018	56.961
2019	57.652
2020	48.898
2021	52.29
2022	54.683
2023	51.192