*Excludes Observations that spanned multiple years

Pre 197014
19701
19712
197215
19736
197412
197512
19763
19770
197815
197926
198023
198164
198244
198354
198454
198563
198665
198751
198841
198956
1990132
199197
199282
199337
199461
199581
199674
199767
199878
199982
200050
2001189
200271
2003104
200461
200571
2006100
200770
200896
2009172
2010125
2011169
2012148
2013118
2014151
2015130
201638
20172
20180
20190
20200
20211
20220
Total3278