*Excludes Observations that spanned multiple years

Pre 19708
19700
19711
19720
19731
19740
19752
19760
19770
19780
19791
19802
19810
19820
19830
19841
198515
198635
198764
1988197
19890
199043
199195
199227
199330
199428
199563
19966
19977
19988
199950
200025
20010
20029
20031
20041
20055
20067
20076
20085
20096
201011
201113
20128
201313
20147
201511
201612
20175
20180
20190
20200
20210
20221
20230
20240
Total830