time, the Oranges reportedly owned as much as 25% of the oil company; their stake is in 2001 was estimated at a minimum of 2%, worth $2.7 billion on the May 21 cutoff date for the Billionaires issue. The family also was estimated to have a 1% stake in financial services firm ABN-AMRO. The royal family's fortune seems to have been hit by declines in real estate and equities after 2008. They were also rumored to have lost up to $100 million when Bernard Madoff's Ponzi scheme collapsed, though the royal house denies the allegations. In 2009, Forbes estimated Queen Beatrix's wealth at US$300 million. This could also have been due to splitting the fortune between Queen Beatrix and her 3 sisters, as there is no right of the eldest to inherit the whole property. A surge in export revenue, recovery in real estate and strong stock market have helped steady royal family's fortunes, but uncertainty over the new government and future austerity measures needed to bring budget deficits in line may dampen future prospects. In July 2010, Forbes magazine estimated her net worth at $200 million This estimate was unchanged in April 2011. List of rulers Stadtholderate under the House of Orange-Nassau Stadtholderate under the Houses of Nassau-Dillenburg and Nassau-Dietz Note: Principality of the Netherlands (1813–1815) Kingdom of the Netherlands (1815–present) Royal family versus royal house Under Dutch law, there is a distinction between the royal family and the Dutch royal house. Whereas 'royal family' refers to the entire Orange-Nassau family, only a small subgroup of it constitutes the royal house. By the Royal House Membership Act 2002, membership of the royal house is limited to: (Article 1) the reigning monarch (King or Queen); (Article 1a) the members of the royal family in the line of succession to the Dutch throne, limited to the second degree of sanguinity reckoned from the reigning monarch; (Article 1b) the heir presumptive of the reigning monarch; (Article 1c) the former monarch (upon abdication); (Article 2) the spouses of the above, even if the above die. (Article 3) H.R.H. Princess Margriet of the Netherlands, (for whom an exception was made); Members of the Royal House lose their membership (and thereby, designation as prince or princess of the Netherlands) if they lose the membership of the Royal House on the succession of a new monarch (not being in the second degree of sanguinity to the