bitcoin market is a rate 27 march

bitcoin market is a today is a low few days up and down why is a low
Bitcoin (BTC)
7992.10 USD (-3.56%)
1.00 BTC (0.00%)

Market Cap
135,403,452,920 USD
16,942,162 BTC
Volume (24h)
6,286,940,000 USD
790,900 BTC
Circulating Supply
16,942,162 BTC
Max Supply
21,000,000 BTC