How do invest in the VIX volatility index? The ProShares ETF's (symbol VIXY) performance numbers don't align with how VIX has performed.

How do I invest in the [Volatility Index - Symbol = VIX?](https://uk.finance.yahoo.com/quote/%5EVIX/)
I did a search, and there are apparently ETFs like [ProShares VIXY](https://www.proshares.com/our-etfs/strategic/vixy) which "seeks investment results, before fees and expenses, that match the performance of the S&P 500® VIX Short-Term Futures Index."

However, the performance of VIXY should closely mimic the performance of the VIX index, but [I'm not seeing this.](https://imgur.com/a/Ox8MT96) As you can see, from the performance in that image, [the price of VIXY back in January 2011 was over $600,000!](https://finance.yahoo.com/quote/VIXY/history/?period1=1294151400&period2=1777518484)

How do I get exposure to the VIX index, which only moves between a minimum of 9 to a maximum of 84 in value? This VIXY ETF went from $630,000 to about $30, which is a -0.999955 decrease, so it doesn't look like a true proxy for the VIX volatility index.