*Excludes Observations that spanned multiple years

Pre 197031
19700
19710
19720
19730
19740
19750
19760
19771
19781
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19901
19910
19920
19930
19940
19950
19960
19970
19980
19990
20000
20010
20020
20031
20040
20050
20060
20071
20080
20090
20100
20110
20121
20132
201412
201565
2016238
20178
201843
20199
202020
202121
20224
20230
20240
Total459