*Excludes Observations that spanned multiple years

Pre 19705
19700
19710
19720
19730
19740
19750
19761
19770
19780
19791
19800
19810
19820
19830
19840
19850
19860
19877
198818
19893
199018
199124
199230
199322
199418
199520
19966
19975
19983
19995
20009
200113
20021
200311
200416
200512
200622
200735
200828
200936
201038
201125
201243
201346
201436
201519
201627
201727
201819
201913
202012
202118
202222
202315
20242
Total731