Year 0-14 1990 4600 1991 5900 1992 7200 1993 8700 1994 10000 1995 12000 1996 13000 1997 15000 1998 16000 1999 17000 2000 18000 2001 19000 2002 19000 2003 20000 2004 20000 2005 20000 2006 20000 2007 20000 2008 19000 2009 18000 2010 18000 2011 17000 2012 16000 2013 16000 2014 15000 2015 14000 2016 13000 2017 13000 2018 12000 2019 12000 2020 12000 2021 11000 2022 12000