*Excludes Observations that spanned multiple years

Pre 19702
19701
19711
19720
19730
19740
19750
19760
19770
19780
19790
19800
19811
19820
19830
19840
19851
19864
198716
19888
19890
19900
19917
19920
19932
19943
19951
19960
19971
19981
19997
20001
20010
20022
20033
20040
20050
20061
20070
200815
20099
20100
20111
20122
20132
20141
20151
20161
20170
20180
20190
20200
20210
Total95