Interval              MPECS Discovery Observations
1999                       4         0           14
2000                      10         0           52
2001                       4         0           17
2002                       4         0           29
2003                       7         0           40
2004                      31         0          381
2005                      24         0          211
2006                       9         0           68
2007                       4         0           25
2008                      11         0           86
2009                       4         0           28
2010                       1         0            2
2011                       0         0            0
2012                       1         0            7
2013                       2         0           14
2014                       1         0            8