*Excludes Observations that spanned multiple years

Pre 19708
19700
19711
19720
19731
19740
19751
19760
19770
19780
19790
19800
19810
19822
19830
19840
19850
19861
19878
19884
19890
19900
19912
19923
19937
19944
199553
199613
19978
199815
19997
20008
20018
20026
20039
20044
20053
20060
20070
200811
200919
201026
201112
20122
20135
20143
20153
20163
20172
20185
20199
20208
202117
202218
202347
202435
Total401