We present a statistical analysis of thermal H⁺ and O⁺ ion flux measurements in the high-altitude (6000-9000 km) polar ionosphere from the Suprathermal ion Mass Spectrometer (SMS) on Akebono. It is shown that the normalized H⁺ polar wind flux (to 2000 km altitude) varies from 10⁷ to 10⁸ cm^-2s^-1 at 2000 km altitudes. Surprisingly, the O⁺ ion flux is found to be comparable to the H⁺ ion flux and much higher than classical theory prediction. The magnetic local time (MLT) distribution of the upward ion flux and its geomagnetic activity (K_p) dependence are also presented. At both magnetically quiet and active times, the integrated H⁺ ion flux is largest in the noon sector (09-15 MLT) and smallest in the midnight sector (21-03 MLT); the flux ratio was found to be approximately one order of magnitude. The total flux of H⁺ ion outflow integrated over the polar ionosphere (ILAT ≥ 75°) and over all local times was found to correlate inversely with the K_p index. The integrated H⁺ flux (ILAT ≥ 75°) in quiet times was 0.9∼1.5 x 10²⁵ ions s^-1 while the flux in active times was a factor of 2∼3 smaller (0.4∼0.6 x 10²⁵ ions s^-1). It also exhibited a slight positive correlation with the IMF (interplanetary magnetic field) B_z component.