*Excludes Observations that spanned multiple years

Pre 19701
19700
19711
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19841
19850
19868
198715
198839
19890
199012
199110
19927
19931
199422
199510
19960
19971
19985
19994
20004
20010
20023
20033
20045
20051
20063
20073
20084
20097
20108
20115
20124
201315
20145
20153
20165
20173
20180
20190
20200
20210
20220
Total218