*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19721
19730
19740
19750
19760
19770
19780
19790
19801
19810
19820
19835
19842
19850
19860
19871
19883
198916
199021
199143
199235
199343
199424
199547
19965
199723
199820
19998
200011
200137
200219
2003105
2004163
2005172
2006119
2007126
2008111
2009127
2010127
2011133
2012162
2013147
2014139
2015161
2016131
2017124
20180
Total2413