The data used in these slides is from the records of historical currency exchange rates on OFX.com. We will use this data to track the value of various currencies from around the globe (in reference to the US dollar) from 1990 to 2020.
Below is a table of first six rows of the data from OFX.com:

   Year British Pound Euro Japanese Yen Australian Dollar Hong Kong Dollar
1: 1990      1.595271   NA     0.006929          0.780686         0.128372
2: 1991      1.784103   NA     0.007436          0.778719         0.128680
3: 1992      1.767354   NA     0.007895          0.735213         0.129195
4: 1993      1.501607   NA     0.009030          0.679935         0.129271
5: 1994      1.531853   NA     0.009801          0.731612         0.129383
6: 1995      1.578470   NA     0.010706          0.740727         0.129271
   Mexican Peso US Dollar
1:           NA         1
2:           NA         1
3:           NA         1
4:     0.320067         1
5:     0.296964         1
6:     0.156684         1