The Ng brothers dominated the list for the sixth year running despite experiencing a dip in their net worth.

The wealth of Singapore's 50 richest slid from $96.9 billion to $92.3 billion over the past year amid a weaker Singapore dollar and a “lacklustre” economy, according to the Forbes Singapore Rich List.

Brothers Robert and Philip Ng, whose family controls Singapore’s Far East Organisation and Hong Kong’s Sino Group, held onto the top spot but saw their wealth decline to $8.7 billion as Singapore's property market slowed as did sales in Hong Kong.

“The Ngs aren’t the only tycoons in Singapore who saw a fall in their net worth. The country’s lacklustre economy coupled with a 9 per cent decline in the Singapore dollar from a year ago and a flat stock market, affected the overall wealth of Singapore’s 50 richest,” Forbes Asia said.

Correspondingly, the minimum amount required to make the list was $420 million, down from $450 million last year.

In second place again was City Developments chairman Kwek Leng Beng, with a net worth of $7.2 billion. In spite of the sluggish property market, City Developments generated record revenues of $2.8 billion in 2014, up 17 per cent from the previous year, thanks to contributions from overseas hotels.

The year's biggest gainer was paint tycoon Goh Cheng Liang, who jumped four spots to third place after his shares in Japan’s Nippon Paint jumped 62 per cent in the past year. During this time, his net worth soared 116 per cent to $6.9 billion.

“Despite the softening of the Singapore dollar, there are 28 billionaires on this year’s Singapore Rich List, up from 26 a year ago. Healthcare entrepreneur Loo Choon Yong (No. 28, $1 billion) of Raffles Medical Group entered the billionaire ranks for the first time, cashing in on the country’s status as a regional medical hub,” Forbes Asia said.

Meanwhile, four individuals dropped off from last year’s list, including Pang Yoke Min as shares at his offshore vessels supplier Pacific Radiance plunged with oil prices.

The top 10 richest in Singapore are:

1) Robert & Philip Ng; $8.7 billion
2) Kwek Leng Beng; $7.2 billion
3) Goh Cheng Liang; $6.9 billion
4) Khoo family; $6.4 billion
5) Wee Cho Yaw; $5.45 billion
6) Eduardo Saverin; $5.4 billion
7) Kwee brothers; $5.2 billion
8) Richard Chandler; $2.6 billion
9) Kuok Khoon Hong; $2.55 billion
10) Raj Kumar & Kishin RK; $2.4 billion

This list was compiled using shareholding and financial information obtained from the families and individuals, stock exchanges, analysts and other sources, Forbes said.