*Excludes Observations that spanned multiple years

Pre 19707
197022
197113
19729
19731
197417
197512
19765
19773
19785
197995
198061
198138
198259
198322
198421
198530
19863
19878
198842
1989214
1990264
199181
199240
199369
199457
199564
199661
199753
199847
199973
200090
200186
2002104
200349
200424
200523
200624
200729
200836
200971
2010129
2011120
201291
2013373
201440
201586
201673
20179
Total2953