bitcion market is a cap up and down

bitcoin market is a daily up and down this is a rate tu one btc and to usd price
Bitcoin (BTC)
$8,317.37 USD (-0.92%)
1.00000000 BTC (0.00%)

  Market Cap
                     $141,718,311,699 USD 
                              17,038,837 BTC 
          Volume (24h)
                          $5,979,940,000 USD 
                           720,227 BTC

Circulating Supply
17,038,837 BTC
Max Supply
21,000,000 BTC