*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19756
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19901
19911
19923
19930
19948
19951
19963
19972
19984
19991
20000
200110
20026
20030
200434
20056
20065
20073
20083
200953
201019
201110
20128
201314
20142
20151
20160
20171
201812
20192
20203
202132
202215
20236
20240
Total275