*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19724
19730
19740
19750
19760
19770
19780
19790
19801
19810
19820
19831
19840
19850
19864
19871
198849
198914
199035
199131
199234
199319
19946
199514
19960
199717
19984
199929
200010
20010
20024
20031
20040
20054
20063
20072
20087
20092
201045
201117
201210
201311
20147
20150
20165
20174
201883
20190
Total480