*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19903
19910
19921
19930
19940
19951
19961
19970
19980
19990
20000
20010
20020
20030
20040
20050
20060
20071
20080
20090
20101
20110
20120
20132
20143
20155
20167
20173
20185
20194
20203
20214
20224
20230
20241
Total49