*Excludes Observations that spanned multiple years

Pre 1970183
197010
19711
19724
19730
19740
197513
19764
19771
19782
19791
19804
19812
19820
19830
19842
19851
19860
19871
19880
19890
19901
19910
199210
199312
19948
19951
19961
19970
19985
19994
20001
20010
20027
20030
20041
200537
200668
20073
200813
200953
201038
201115
201210
20136
20142
20150
20160
20172
20182
20190
20200
20210
Total529