Schwarzenegger's net worth had been conservatively estimated at $100–$200 million. After separating from his wife, Maria Shriver, in 2011, it has been estimated that his net worth has been approximately $400 million, and even as high as $800 million, based on tax returns he filed in 2006. Over the years as an investor, he invested his bodybuilding and movie earnings in an array of stocks, bonds, privately controlled companies, and real estate holdings worldwide, making his net worth as an accurate estimation difficult to calculate, particularly in light of declining real estate values owing to economic recessions in the U.S. and Europe since the late 2000s. In June 1997, Schwarzenegger spent $38 million of his own money on a private Gulfstream jet. Schwarzenegger once said of his fortune, "Money doesn't make you happy. I now have $50 million, but I was just as happy when I had $48 million." He has also stated, "I've made many millions as a businessman many times over."