| Dec'17 | Dec'16 | Dec'15 | Dec'14 | Dec'13 | Dec'12 | Dec'11 | Dec'10 | Dec'09 | Dec'08 | Dec'07 |
|---|---|---|---|---|---|---|---|---|---|---|
System Sales [Member] | ||||||||||
Service and Field Option Sales [Member] | ||||||||||
Number of ordinary shares used in computing per share amounts | ||||||||||
Basic | ||||||||||
429,800 | 425,600 | 430,600 | 437,142 | 429,770 | 424,096 | 425,618 | 435,146 | 432,615 | 431,620 | 462,406 |
Diluted | ||||||||||
431,600 | 427,700 | 432,600 | 439,693 | 433,446 | 426,986 | 429,053 | 438,974 | 432,615 | 434,205 | 485,643 |