BMW is celebrating the 15th anniversary of the X5 by taking a look back at the popular model.

BMW is celebrating the 15th anniversary of the X5 by taking a look back at the popular model.

Described as a "unique success story," the X5 was launched in 1999 to battle the Mercedes M-Class which was introduced two years earlier. The model proved to be immensely popular as the company built nearly 620,000 units of the first-generation crossover.

That success pushed BMW to introduce an assortment of other crossovers including the X1, X3, X4 and X6. Those models have also proved popular as BMW has sold more than 3.3 million X models worldwide and nearly a third of all BMWs sold today are an X model.

Speaking about X models, BMW confirmed the 2017 X7 will be an "exceptionally large and luxurious."

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BMW celebrates the 15th anniversary of the X5