*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19762
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19901
19915
19920
19930
19940
19950
19965
19973
19981
19990
20000
20010
20020
20030
20043
20052
200612
20073
200839
200967
201034
201125
201231
201312
201411
201519
201625
20172
20181
20192
20200
20211
20220
20230
20244
Total311