*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19850
19860
19870
19880
19890
19900
19919
19926
199313
19945
199517
19964
19979
19980
19992
20000
20010
20023
20030
20041
20050
20060
20071
20080
20091
20101
20111
20120
20136
20141
20152
20164
20174
201823
20193
20203
20210
20220
Total120