*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19760
19770
19781
19792
19801
19811
19826
198315
19846
198512
198621
198719
198816
198916
199025
199123
199219
199318
199424
199514
199627
199728
199842
199932
200040
200128
200219
200328
200420
200535
200635
200737
200828
200939
201052
201153
201247
201339
201456
201538
201615
20170
20180
Total979