*Excludes Observations that spanned multiple years

Pre 19703
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19850
19861
19870
19880
19890
19903
19916
19920
19933
19947
199524
19969
19971
19984
19990
20000
20010
20020
20030
20049
20056
20066
20071
20089
200934
201060
201114
201235
201317
201429
201521
201611
20170
20180
20190
20200
20210
20220
Total314