*Excludes Observations that spanned multiple years

Pre 19706
19700
19710
19720
19731
19740
19750
19760
19770
19782
19790
19800
19810
19823
19830
19841
19852
19869
19872
198815
19890
19907
19912
199214
199311
19947
19956
19966
19974
19986
199911
200010
20018
20023
200310
20043
20050
20060
20073
20081
20093
20101
20112
201223
201323
20146
20150
20162
20172
20182
20191
20200
20212
20228
202317
20241
Total246