Year 0-14 1990 2200 1991 2900 1992 3800 1993 4700 1994 5700 1995 6900 1996 8100 1997 9300 1998 10000 1999 12000 2000 13000 2001 14000 2002 15000 2003 16000 2004 17000 2005 18000 2006 19000 2007 19000 2008 20000 2009 21000 2010 21000 2011 21000 2012 21000 2013 21000 2014 21000 2015 20000 2016 20000 2017 19000 2018 17000 2019 17000 2020 16000 2021 15000 2022 15000