Country Value in 2012 Value in 2015 Value in 2016 India 2.41 23.2 29.4 Belgium[1] 13.9 19.9 18.9 Israel 3.45 14.8 14.1 South Africa 8.38 9.83 10.9 United Arab Emirates 3.12 8.66 8.22 Hong Kong 1.05 7.79 7.59 United States 0.64 6.81 5.64 Russia 4.67 4.22 5.58 Switzerland 1.82 3.11 2.95 Canada 1.69 2.58 2.35 China 0.01 1.99 1.16 Angola 0 1.67 1.91 United Kingdom 10.2 1.58 1.32 Thailand 0.16 1.24 0.91 Singapore 0.05 1.03 1.13