Interval              MPECS Discovery Observations
2005                       5         0           15
2006                      17         0           70
2007                      23         0          100
2008                      65         0          348
2009                      58         0          312
2010                      28         0          179
2011                      16         0           71
2012                      15         0           77
2013                       8         0           32
2014                      10         0           36
2015                       3         0           15
2016                       1         0            4
2017                       3         0           13
2018                       0         0            0
2019                       0         0            0
2020                       0         0            0
2021                       0         0            0
2022                       1         0            9