*Excludes Observations that spanned multiple years

Pre 19704
19701
19710
19720
19730
19740
19750
19760
19772
19780
19792
19801
19810
19820
19831
19844
19858
19860
198721
198838
19893
199012
199140
199255
199341
199420
199527
199635
199736
19984
199914
200041
200116
20027
20035
200428
20052
20067
200719
200829
20099
20108
20111
20120
20130
20142
20152
20163
20175
20182
20195
202013
20213
20228
20230
20240
Total584