Year Personnel 1989 15000 1990 15000 1991 15000 1992 15000 1993 15000 1994 15000 1995 15000 1996 15000 1997 15000 1998 15000 1999 15000 2004 18000 2005 19000 2007 19000 2008 19000 2009 18550 2014 25000 2015 25000 2016 25000 2017 27000 2018 27000 2019 134000 2020 27000