The number of US tourists traveling to the UK reached the highest point of 3,2 million in 2015. 에서는 그냥 US인데 9번 예문의 The economic contribution of students from overseas in the US grew significantly. 에서는 the US 이네요. 왜 앞에는 the 가 없고 뒤에는 the 가 붙은건가요?
For UK tourist, growth was slow until 2013, when it started to increase dramatically. 와 The number of US residents traveling to the UK remained at around 2.8 million in 2011 and 2012, but fell slightly in 2013. 에서 UK도 마찬가지에요. 왜 the 가 없고 있는건가요