*Excludes Observations that spanned multiple years

Pre 19700
19702
19711
19720
19730
19741
19750
19761
19771
19781
19790
19800
19810
19822
19832
19840
19851
19863
19874
198824
19899
199010
199123
199217
19939
199415
199525
199613
199731
199816
19994
200017
20011
20022
200318
200416
200521
20068
20077
20087
200910
201020
201116
201212
20139
20149
201512
201611
20177
20180
Total418