Year	% of population
1990	100
1991	100
1992	100
1993	100
1994	100
1995	100
1996	100
1997	100
1998	100
1999	100
2000	100
2001	99.9
2002	99.9
2003	99.8
2004	99.8
2005	99.7
2006	99.7
2007	99.7
2008	99.7
2009	99.7
2010	100
2011	100
2012	100
2013	100
2014	100
2015	100
2016	100
2017	100
2018	100
2019	100
2020	100
2021	100
2022	100