Year 0-14 1990 13000 1991 15000 1992 18000 1993 19000 1994 21000 1995 23000 1996 24000 1997 25000 1998 26000 1999 26000 2000 26000 2001 26000 2002 26000 2003 25000 2004 24000 2005 23000 2006 22000 2007 21000 2008 20000 2009 19000 2010 18000 2011 17000 2012 16000 2013 15000 2014 14000 2015 13000 2016 12000 2017 11000 2018 10000 2019 9800 2020 8800 2021 8000 2022 7400