*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
197278
197315
19740
19750
19761
19770
19780
19790
19800
19810
19821
19830
198423
19853
198633
198769
1988104
198978
199065
1991118
199273
199351
199411
199536
19965
199735
199810
199984
2000107
2001102
200224
200342
200474
200561
200630
200746
200834
200929
201039
201151
201256
201353
201467
201550
201652
201744
20180
Total1855