Year | January | February | March | April | May | June | July | August | September | October | November | December |
1987 | 0.3 | 1.3 | 0.7 | 0.7 | 1.2 | 0.3 | 0.8 | 0.2 | 0 | 0.8 | 0.3 | 0.5 |
1988 | 0 | 0 | 0.3 | 0 | 0.5 | 0.3 | 0.5 | 0.5 | 0.5 | 0 | 0.3 | 0 |
1989 | 0.7 | 0 | 0 | 0.3 | 0.5 | 0 | 0.8 | 0.2 | 1 | 0 | 0 | 0.5 |
1990 | 1 | 0.7 | 0.3 | 1 | 0.5 | 0 | 0.2 | 0.8 | 1.5 | 0.8 | 0.8 | 1 |
1991 | 0.3 | 0 | 0 | 0.7 | 0.8 | 0 | 1.2 | 0.8 | 0.5 | 0 | 0.3 | 0.5 |
1992 | 2.3 | 0.3 | 0.7 | 0.7 | 1 | 1 | 1 | 0.5 | 0 | 0.3 | 1 | 0 |
1993 | 1 | 0.3 | 0.7 | 0.3 | 0.5 | 0.7 | 0 | 0.5 | 0.5 | 0.8 | 1.3 | 0.5 |
1994 | 1 | 0.7 | 0.3 | 0.3 | 0 | 0 | 0.2 | 0.2 | 1 | 0.3 | 0.3 | 0.5 |
1995 | 0.7 | 1.3 | 0 | 1.3 | 0 | 0.7 | 4.5 | 4.5 | 1 | 2 | 1 | 1.5 |
1996 | 0.7 | 0.7 | 2.3 | 0 | 1 | 2 | 1 | 1 | 1.5 | 1 | 0.3 | 2.5 |
1997 | 1.3 | 0 | 0.7 | 1.3 | 1.5 | 0.7 | 1 | 1 | 0.5 | 1 | 0.8 | 4 |
1998 | 1.3 | 4 | 1.3 | 2.3 | 0.8 | 2 | 0.8 | 0.8 | 2.5 | 0.3 | 1 | 0 |
1999 | 1 | 0.7 | 2 | 2 | 0.2 | 0.7 | 0.8 | 0.8 | 1.5 | 1.3 | 1 | 0.5 |
2000 | 1 | 1 | 1.3 | 0 | 0.8 | 1 | 0.2 | 0.2 | 1 | 0.3 | 0.3 | 1.5 |
2001 | 0.3 | 1 | 0 | 1 | 1.5 | 1 | 1 | 1 | 1.5 | 1 | 0 | 1 |
2002 | 1.7 | 1.3 | 1 | 0 | 3 | 1 | 1.5 | 1.5 | 2 | 0.3 | 2 | 2 |
2003 | 1.3 | 0.7 | 1.7 | 1.3 | 2 | 1.6 | 1.3 | 1.3 | 5 | 1.7 | 2 | 1.5 |
2004 | 0.3 | 1.3 | 1.7 | 2 | 0.8 | 1.6 | 1.5 | 1.5 | 2 | 2 | 1.3 | 1.5 |
2005 | 0.3 | 3.3 | 1 | 1 | 1 | 1.6 | 1.5 | 1.5 | 2 | 3 | 1.6 | 1 |
2006 | 1.3 | 0.7 | 0.3 | 0.3 | 1.4 | 1.6 | 1.3 | 1.3 | 1.5 | 2 | 3.6 | 1.5 |
2007 | 2 | 1.3 | 1.7 | 0.7 | 2.5 | 1.6 | 1 | 1 | 1.5 | 2 | 2 | 2.5 |
2008 | 1.7 | 0.7 | 0.7 | 2.3 | 0.2 | 1.6 | 1 | 1 | 2.5 | 2 | 1 | 2.5 |
2009 | 1.3 | 0 | 1 | 0.7 | 0 | 0 | 0.5 | 0.5 | 0 | 2.3 | 0.3 | 0.5 |
2010 | 0 | 1 | 0.3 | 0 | 0.8 | 0 | 1.5 | 1.5 | 0.5 | 1.3 | 0.3 | 0.5 |
2011 | 0.3 | 0.7 | 1.7 | 0.3 | 0.2 | 0.3 | 0.2 | 2 | 0 | 1.3 | 0.6 | 1.5 |
2012 | 0.3 | 1 | 0 | 0.7 | 0.2 | 1.6 | 0.8 | 1 | 0 | 0.7 | 0.3 | 0 |
2013 | 0 | 0 | 0 | 1.3 | 3 | 1.6 | 0.2 | 0.5 | 1.5 | 2.3 | 1 | 2.5 |
2014 | 1.7 | 1 | 1.7 | 2 | 2 | 1.3 | 1 | 1.5 | 1.5 | 1.3 | 0.6 | 2 |
2015 | 0.7 | 1.7 | 1.3 | 0.7 | 1.5 | 1 | 0.8 | 0.8 | 1.5 | 1.3 | 1.6 | 2.5 |
2016 | 1.7 | 0.7 | 0.7 | 1.3 | 1.2 | 0.7 | 0.5 | 0.5 | 2.5 | 1 | 1.3 | 0.5 |
2017 | 1.7 | 0.7 | 1.7 | 1.3 | 1.2 | 1.6 | 1.1 | 1.3 | 2 | 1.7 | 1 | 1.5 |