*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19731
19740
19750
19761
19770
19780
19792
19800
19810
19820
19832
19840
19850
19862
19871
19881
19890
19903
19917
199211
19937
19945
199512
19960
19979
19985
199911
20006
20015
20024
20034
20041
20050
20060
200718
200815
20095
20103
20118
201210
20135
20143
20151
20165
20176
20182
20191
20200
20210
20220
Total183