June 25 (Reuters) - Speculators decreased their net short dollar positions in the latest week, according to calculations by Reuters and U.S. Commodity Futures Trading Commission data released on Friday. The value of the net short dollar position fell to $12.80 billion in the week ended June 22, compared with a net short of $18.99 billion the previous week. In a wider measure of dollar positioning that includes net contracts on the New Zealand dollar, Mexican peso, Brazilian real and Russian rouble, the U.S. dollar posted a net short position of $13.04 billion, compared with a net short of $19.06 billion a week earlier. Japanese Yen (Contracts of 12,500,000 yen) Net dollar long by $6.085 billion 22 Jun 2021 week Prior week Long 34,118 22,974 Short 87,980 69,824 Net -53,862 -46,850 EURO (Contracts of 125,000 euros) Net dollar short by $-13.29 billion 22 Jun 2021 week Prior week Long 207,863 210,816 Short 118,806 92,630 Net 89,057 118,186 POUND STERLING (Contracts of 62,500 pounds sterling) Net dollar short by $-1.563 billion 22 Jun 2021 week Prior week Long 51,445 55,203 Short 33,518 23,033 Net 17,927 32,170 SWISS FRANC (Contracts of 125,000 Swiss francs) Net dollar short by $-1.846 billion 22 Jun 2021 week Prior week Long 20,980 14,875 Short 7,428 5,488 Net 13,552 9,387 CANADIAN DOLLAR (Contracts of 100,000 Canadian dollars) Net dollar short by $-3.513 billion 22 Jun 2021 week Prior week Long 69,074 73,071 Short 25,849 28,817 Net 43,225 44,254 AUSTRALIAN DOLLAR (Contracts of 100,000 Aussie dollars) Net dollar long by $1.327 billion 22 Jun 2021 week Prior week Long 56,133 40,139 Short 73,708 58,019 Net -17,575 -17,880 MEXICAN PESO (Contracts of 500,000 pesos) Net dollar long by $-0.703 billion 22 Jun 2021 week Prior week Long 61,955 68,675 Short 90,546 92,605 Net -28,591 -23,930 NEW ZEALAND DOLLAR (Contracts of 100,000 New Zealand dollars) Net dollar short by $-0.231 billion 22 Jun 2021 week Prior week Long 19,171 18,466 Short 15,885 15,201 Net 3,286 3,265 Reporting By Karen Brettell Our Standards: The Thomson Reuters Trust Principles.