Interval              MPECS Discovery Observations
1999                       2         0            7
2000                       3         0           50
2001                      11         0           51
2002                      16         0          104
2003                      21         0          125
2004                       7         0          103
2005                       0         0            0
2006                      10         0           69
2007                      15         0          129
2008                       3         0           23
2009                       4         0           37
2010                       8         0           75
2011                       4         0           55
2012                       4         0           42