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*Excludes Observations that spanned multiple years

Pre 19701
19700
19715
19726
19738
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19845
19852
198615
198715
198849
19890
199013
199117
19927
19931
199422
199510
19960
19971
19985
19994
20004
20010
20023
20033
20045
20051
20063
20073
20084
20097
20107
20115
20124
201315
20145
20153
20165
20173
20180
20190
20200
20210
Total266