2012: 406 dolar 2013: 386 dolar 2014: 348 dolar 2015: 430 dolar 2016: 384 dolar 2017: 332 dolar 2018: 356 dolar 2019: 331 dolar 2020: 336 dolar 2021: 318 dolar 1 Temmuz 2022: 330 dolar