Every Years i still see that this time are lowest price in BTC.
Bitcoin is open-source; its design is public, nobody owns or controls this cryptocurrency and everyone can take part. Bitcoin price grew significantly within a short period of time making the BTC/USD pair quite popular among active traders and investors. Through many of its unique properties, Bitcoin allows exciting uses that could not be covered by any previous payment system.
anyone Can Explain this isue..?
USD is the world's reserve currency, can be seen as the most common currency to trade between countries of investors and the market. It was bound to be one of the most popular pairings among traders. Having 62% of global foreign exchange reserves held by central banks being denominated by USD speaks already for itself. As said by the previous poster, USD and USDT has a 1:1 exchange rate which means a stable value for it. And the existence of USDT as a coin to trade with Bitcoin also enables investors to stash away money while not being swept away by the cryptocurrency changes in the market but can still be accessed at the same value when a good deal or trade comes up.