*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19904
19911
19920
19931
19940
199511
199612
19973
19980
19992
20007
20018
20021
200323
20042
200512
20065
20078
20084
20097
201013
20114
20127
20131
20144
20152
20162
20172
20184
20192
20204
20210
20220
20230
20240
Total156