Year Personnel 1985 10100 1989 15000 1990 18000 1991 18000 1992 18000 1993 18000 1994 14000 1995 17400 1996 17400 1997 17350 1998 17000 1999 17000 2000 15400 2001 15600 2002 15200 2003 18600 2004 18000 2005 19000 2006 19000 2007 19000 2008 19000 2009 18620 2010 18620 2011 18600 2012 18600 2013 18600 2014 18600 2015 18600 2016 18600 2017 19000 2018 18600 2019 19000 2020 19000