Here's what your pivot table should look like — Country × Year → Sum of Net Revenue:
| customer_country | 2013 | 2014 | 2015 | Totals |
|---|---|---|---|---|
| Argentina | $1,210 | $5,839 | $1,455 | $8,504 |
| Austria | $38,486 | $57,402 | $40,807 | $136,695 |
| Belgium | $3,568 | $10,196 | $19,349 | $33,113 |
| Brazil | $20,149 | $41,940 | $18,527 | $80,616 |
| Canada | $4,352 | $20,874 | $6,877 | $32,103 |
| Denmark | $7,856 | $12,494 | $5,455 | $25,805 |
| Finland | $4,432 | $10,816 | $6,489 | $21,737 |
| France | $14,685 | $33,907 | $16,942 | $65,534 |
| Germany | $56,399 | $99,692 | $72,468 | $228,559 |
| Ireland | $12,735 | $22,482 | $8,336 | $43,553 |
| Italy | $3,004 | $8,367 | $5,212 | $16,583 |
| Mexico | $1,838 | $3,652 | $4,258 | $9,748 |
| Norway | $2,108 | $3,515 | $929 | $6,552 |
| Poland | $1,244 | $2,376 | $3,102 | $6,722 |
| Portugal | $3,601 | $8,217 | $4,880 | $16,698 |
| Spain | $3,952 | $6,828 | $4,419 | $15,199 |
| Sweden | $8,312 | $13,695 | $10,472 | $32,479 |
| Switzerland | $4,507 | $7,291 | $6,624 | $18,422 |
| UK | $14,082 | $26,459 | $22,612 | $63,153 |
| USA | $60,154 | $105,346 | $72,908 | $238,408 |
| Venezuela | $8,574 | $20,428 | $4,777 | $33,779 |