*Excludes Observations that spanned multiple years

Pre 19706
19701
19712
19720
19730
19740
19750
19760
19771
19780
19792
19800
19810
19823
19830
19843
19855
19860
19872
198832
19891
199022
199193
199271
199390
199413
199597
199612
199710
19983
19994
200020
20018
20028
20035
200412
20051
20069
200710
200842
200931
20105
20111
20122
201312
20144
20150
201610
20178
20183
20193
20205
20210
20220
Total672