*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19884
19890
19900
19910
19920
19930
19940
19952
19960
19970
19980
19991
200010
20011
20020
20030
20043
20050
20060
20070
20081
20092
20105
20113
20120
20132
20143
201533
201682
2017123
201835
201947
20202
20210
20220
20230
20240
Total360