New Delhi: Indian billionaires Mukesh Ambani and Gautam Adani have been witnessing a constant decline in their net worth for some time now. To recall both of these business magnates were ranked among the worlds top 10 richest individuals. Today only Mukesh Ambani is in the worlds top 20 richest individuals list. Even Mukesh Ambani is currently out of the USD 100 billion club. According to the reports the main reason behind the decline in the net worth of these billionaires is the downturn in the stock market. The Indian stock market has fallen significantly from its peak. With the dip of the share prices of the companies the net worth of these billionaires is also coming down. Meanwhile Elon Musk remains the worlds richest person with a net worth of USD 351 billion. Notably his net worth has also declined by USD81.4 billion so far this year. Ambanis Net Worth Drops by Rs 10500 Crore in a Single Day As per the Bloomberg Billionaires Index data the net worth of Reliance Industries chairman dropped by USD 1.21 billion (Rs 10500 crore) in a single day. With this decline Mukesh Ambanis net worth now stands at USD 83.8 billion. So far this year his net worth has decreased by USD 6.81 billion. In the list of the worlds richest people Mukesh Ambani has slipped to the 17th position. Gautam Adanis Net Worth Also Declines Adani Group Chairman Gautam Adanis net worth has also dropped massively. In a single day his net worth fell by USD 1.79 billion equivalent to Rs 15600 crore. As a result Adanis net worth now stands at USD 63 billion. So far this year his net worth has declined by USD 15.7 billion. He is currently ranked 22nd on the list of the worlds richest people.