*Excludes Observations that spanned multiple years

Pre 19700
19701
19713
19720
19730
19740
19750
19760
19770
19781
19793
19800
19810
19821
19830
19840
19851
19864
19870
198838
198913
199011
199126
199240
1993121
199414
1995105
199638
199756
199822
199937
200026
200153
200223
20032
200418
20056
200613
200710
200813
200910
20103
201112
20122
20136
20147
20150
201614
201710
20184
20192
20200
20210
20220
Total769