public void decrementYear(int count) {
        WebElement yearInput = showPanel().findElement(By.cssSelector("input.ui-datepicker-year"));
        for (int i = 0; i <  count; i++) {
            yearInput.sendKeys(Keys.ARROW_DOWN);
        }
    }
Decrement the years by count.

@param count the number of years to decrement
primefaces-selenium/primefaces-selenium-components/src/main/java/org/primefaces/selenium/component/DatePicker.java