*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19801
19810
19820
19830
19840
19850
19860
19870
19882
19894
199011
199120
19928
199340
199412
199511
199612
199710
19985
19993
20002
200117
20026
200346
200469
200579
200657
200764
200857
200955
201054
201182
201276
201389
201483
201584
201655
201771
20180
Total1185