*Excludes Observations that spanned multiple years

Pre 19701
19700
19711
19720
19730
19740
19750
19760
19770
19780
19790
19801
19810
19820
19830
19842
19850
19869
19876
19884
19896
19907
199122
199215
199325
199412
199521
19967
19977
19983
19994
20006
20012
20027
20036
200419
200515
20066
20071
200812
20091
201037
201189
20127
20134
20147
20150
20161
20170
Total373