*Excludes Observations that spanned multiple years

Pre 19701
19701
19710
19720
19730
19740
19750
19760
19770
19781
19790
19802
19810
19820
19830
19840
19850
19860
19873
19884
19890
19902
19912
19920
199370
19940
19956
19960
19972
19980
199944
200030
200124
20024
20031
200446
20054
20060
200714
200819
20094
20108
20119
20126
201314
201412
20154
201610
20177
201820
201919
20205
20219
20227
202320
20240
Total434