Interval              MPECS Discovery Observations
1995                       0         0            2
1996                       0         0            1
1997                       0         0            0
1998                       0         0            3
1999                       0         0            0
2000                       1         0            0
2001                       0         0            1
2002                       1         0            0
2003                       1         0            2
2004                       0         0            0
2005                       1         0            0