*Excludes Observations that spanned multiple years

Pre 197054
19701
19716
19720
19730
19741
19750
19760
19771
19781
19790
19800
19810
19820
19831
19841
19850
19864
19875
19887
198928
19903
19913
19929
19932
199438
199518
19961
19977
19981
199916
20000
200112
20025
20032
200411
200521
20062
20075
20085
20091
20106
201112
20126
20138
20145
20155
20164
201711
20185
201911
202013
202114
202216
20239
20245
Total402