*Excludes Observations that spanned multiple years

Pre 197011
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19864
19876
198846
19898
19909
19916
199210
19933
19941
19951
19964
199710
19983
19995
20003
20011
20021
20035
20040
20053
20067
20073
20084
20096
20101
20110
20125
201312
20142
20153
20162
20172
20182
20191
20201
20211
20220
Total192