*Excludes Observations that spanned multiple years

Pre 19703
19700
19711
19726
19732
19740
19751
19760
19770
19781
19790
19800
19810
19821
19834
19840
198517
198665
198770
198881
198960
1990149
1991216
1992169
199346
19943
199510
19962
199710
199817
199999
200049
200172
200217
20035
200457
200515
200614
20075
200817
200911
201021
201124
201227
201318
201426
201538
201641
201734
20180
Total1524