Mining rewards?

when checking an explorer, it shows a total of 155 million CTC was mined. How is this possible? The total mined rewards up to block 278,910 were 61,918,020 CTC, as miners received 222 CTC per block during this period. From block 278,911 to block 715,239, miners earned an additional 12,217,212 CTC, with the block reward reduced to 28 CTC per block. The sum of rewards from these two periods is 61,918,020 CTC + 12,217,212 CTC = 74,135,232 CTC.