date | obsValue |
---|---|
1990 | 274.2 |
1991 | 290.6 |
1992 | 281.6 |
1993 | 291.1 |
1994 | 280.6 |
1995 | 285.3 |
1996 | 310.0 |
1997 | 298.1 |
1998 | 298.3 |
1999 | 294.0 |
2000 | 290.9 |
2001 | 305.3 |
2002 | 298.6 |
2003 | 308.7 |
2004 | 308.7 |
2005 | 308.8 |
2006 | 305.5 |
2007 | 286.1 |
2008 | 300.3 |
2009 | 297.6 |
2010 | 317.0 |
2011 | 281.1 |
2012 | 295.4 |
2013 | 298.2 |
2014 | 263.2 |