Year	mm per year
1993	824
1994	824
1995	824
1996	824
1997	824
1998	824
1999	824
2000	824
2001	824
2002	824
2003	824
2004	824
2005	824
2006	824
2007	824
2008	824
2009	824
2010	824
2011	824
2012	824
2013	824
2014	824
2015	824
2016	824
2017	824
2018	824
2019	824
2020	824