This is probably the worst analysis I've ever seen. The OP simply cherry picked the high and low for each year, and then concluded that BTC lost a certain percentage based on the high and low for the year! Unfortunately for the OP, the price of BTC wasn't at the high on January 1st of each year and at the low on December 31st.

Using the same logic in reverse, one can also conclude that BTC was the best investment in those years because it gained an astronomical amount during that year based on the difference between the high and the low.

Move along, there is nothing to see here...