@misc{r2020gross,
  title = {Gross domestic product (GDP) of the wholesale and retail industry of Singapore from 2010 to 2019}
  author = {R. Hirschmann},
  url = {https://www.statista.com/statistics/625668/gdp-of-the-wholesale-and-retail-industry-in-singapore/},
  year = {2020}
}