*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19733
19741
19750
19761
19770
19780
19790
19800
19812
19821
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19970
19980
19990
20000
20010
20020
20030
20040
20050
20060
20070
20084
20092
20104
201185
201211
201312
201458
2015319
2016507
201758
2018121
2019101
202026
Total1316