*Excludes Observations that spanned multiple years

Pre 19703
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19851
19861
19870
19883
19890
19908
199112
19928
199331
19948
199511
19968
19973
19980
199916
20008
20010
20020
200312
20045
20054
200611
20078
200812
20097
201016
20117
20126
20133
20143
20150
20162
20174
20182
20191
20201
20210
20222
20230
20240
Total227