*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
19900
19910
19920
19930
19940
19950
19960
19970
19980
19990
20000
20010
20020
20031
20042
20055
20062
20070
20081
20096
20107
201122
201214
201383
201497
2015136
2016139
2017153
2018204
2019152
20200
Total1024