Year	ages 15+
1990	200
1991	500
1992	500
1993	540
1994	730
1995	970
1996	1200
1997	1400
1998	1500
1999	1600
2000	1600
2001	1700
2002	1600
2003	1500
2004	1500
2005	1500
2006	1500
2007	1500
2008	1500
2009	1600
2010	1600
2011	1600
2012	1600
2013	1600
2014	1700
2015	1800
2016	1800
2017	1900
2018	1900